Blog showing up just a blank page

Yesterday I uploaded a new blog theme. Used theme test drive plugin. Have not seen my blog since. It just loads into a blank page. Been working all last night and today with my web hosting tech support to get something to show up at https://www.1stopmom.com. I really need to get all my posts and content from /blog site. It would be great if I could get the site back up and running but I will be grateful for any help at all. I can not access my dashboard or anything. Tried to backup usings phpMyadmin and that did not work either.